Black & Decker HEPAFresh&trade; Air Cleaner XL BXAP250 3 Speed HEPA Purifier with Pre and Charcoal Filters Multi-layer HepaFresh filter captures up to 99% of common allergens including dust mites, mold spores, pollen and pet dander; Pre-filter layer captures large particles. Carbon filter layer reduces household odors caused by pets, cooking and smoking. 28" tower design is great for use in large rooms Ultra quiet when running making it easy to keep on while sleeping Electronic control panel offers 3 fan speeds, 8-hr timer and a filter replacement indicator Uses Black+Decker HEPAFresh replacement filter # BXFLTZ or GermGuardian HEPA replacement filter # FLT5000. To lengthen the life of your filter, a 4 pack of the carbon filters is also available (model FLT28CB4).